Any major brand 5w20 oil. The filter is just as important as the oil. Use a name brand filter such as AC/Delco, Purolator, & Wix. Click the link to my blog where I discuss changing your oil.
The oil filter for a 2007 G6 is at the front corner of the engine. It is located inside of the oil filter case.
synthetic Castrol 5W20
5 quarts!
5w-30 oil is what you want in your favorite brand.
Where is the thermostat located on my 2007 Pontiac g6
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4 quarts.
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The Fuel Tank capacity for 2007 Pontiac G6 sedan is 16 gal.